bootstrap-table不分页时对数值类型数据的排序（百分比）

html代码

<table id="table"></table>

数据如下

[
    {"name":"三洋","num":"10","pecent":"29%"},
    {"name":"松下","num":"9","pecent":"28%"},
    {"name":"美的","num":"7","pecent":"20%"},
    {"name":"小天鹅","num":"3","pecent":"8%"},
    {"name":"飞利浦","num":"12","pecent":"32%"}
]

对应的JS代码

$("#table").bootstrapTable({
    dataType: "json",
    method: 'get',
    contentType: "application/x-www-form-urlencoded",
    cache: false,
    url:"data/sortData.json",
    columns:[
        {
            field: 'name',
            title: '品牌名称',
            valign:"middle",
            align:"center",
            sortable:true
        },
        {
            field: 'num',
            title: '门店数量',
            valign:"middle",
            align:"center",
            sortable:true,
            sorter:numSort
        },{
            field: 'pecent',
            title: '市场份额',
            valign:"middle",
            align:"center",
            sortable:true,
            sorter:percentSort
        }
    ]
})
function numSort(a, b) {
    return b-a;
}
function percentSort(a, b) {
    var value_a = a.substr(0, a.length-1)
    var value_b = b.substr(0, b.length-1)
    return value_b-value_a;
}